Peter N. Silvestri

The inspector general for Cook County is investigating issues raised by a Tribune series that documented widespread errors and unfairness in property valuations produced by Assessor Joseph Berrios, the Tribune has learned.

The new inquiry into the Tribune findings is part of a broader investigation by an inspector general's office that has sparred with Berrios about his authority over the two-term assessor's operations.

This development comes at a time when Berrios, the Cook County Democratic Party chairman, is under increasing pressure on a number of fronts in the aftermath of the Tribune investigative series, "The Tax Divide." An extensive Tribune analysis found...

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